The OrthoImage Plugin

Table of Contents

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Summary

The OrthoImage plugin was created to allow users to quickly create
orthogonal (non-perspective), spectral image cubes of a scene. These
images can be used to analyze the spatial and spectral content of the
scene or to make simple example images of the scene.

Input

Rather than construct a carefully crafted platform file with a long focal
length (to avoid persepctive effects), an appropriate platform motion,
an appropriate task set and a simplified atmospheric configuration, the
plugin dramatically simplifies the simulation configuration. The user
needs to setup a streamlined configuration and use it with the desired
scene file.

The input configuration file is a JSON formatted file. An example is shown
below:

(required) The spectral bandpass for the output image to be created. At
this time only microns units are supported.

gsd

(required) The ground sampling distance (GSD) for the output image to be
created. The units are meters.

filename

(required) The name of the output ENVI image file. Note that this plugin
does honor the --output_folder and --output_prefix command line
options.

center

(optional) The XY location (in the Scene ENU coordinates) for the center
of the image.

size

(optional) The size of the output image file. The default is 1024 x 1024.

Usage

To use the OrthoImage plugin in DIRSIG5, the user must use the newer
JSON formatted simulation input file (referred to a JSIM
file with a .jsim file extension). At this time, these files are
hand-crafted (no graphical editor is available). An example is shown
below: